WO2021184927A1

WO2021184927A1 - Projection apparatus and projection control method therefor

Info

Publication number: WO2021184927A1
Application number: PCT/CN2020/142158
Authority: WO
Inventors: 李士杰; 唐晓峰; 吴超; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-03-20
Filing date: 2020-12-31
Publication date: 2021-09-23
Also published as: CN113495414A

Abstract

A projection apparatus (100) and a projection control method therefor. The projection apparatus (100) comprises a light source device (10), a spatial light modulator (30) and a control device (60). The light source device (10) is used for illuminating a predetermined area (A). The light source device (10) comprises a moving mechanism (12) and a light source module (14). The moving mechanism (12) comprises a driving member (121) and a rotating member (123) connected to the driving member (121). The rotating member (123) can rotate around a central shaft (O) under the driving of the driving member (121). The light source module (14) is connected to the rotating member (123), and the light source module (14) comprises a plurality of light source groups (141). The plurality of light source groups (141) are sequentially arranged outwards in a direction away from the central shaft (O). Each light source group (141) comprises at least one light-emitting unit (1411), and each light-emitting unit (1411) can individually control light emission. A movement trajectory of the light source module (14) when moving under the driving of the rotating member (123) covers the predetermined area (A). The spatial light modulator (30) is arranged on a light path of light source light and is used for modulating the light source light, so as to obtain a modulated image. The projection apparatus (100) can achieve high dynamic range (HDR) brightness modulation at a low cost.

Description

Projection equipment and its projection control method

Technical field

The present invention relates to the technical field of optical projection, and more specifically, to a projection device and a projection control method thereof.

Background technique

With the development of display technology, the application of projection equipment has become more and more extensive, including education projectors, home projectors and engineering projectors. Projection technology has brought great changes to people's lives, studies and work. People's demand for the display quality of projection equipment is also increasing, and the demand for high dynamic range display is increasing day by day. In this context, it is required that the projection equipment should have the ability to modulate the regional brightness. Therefore, how to realize the brightness modulation of the designated area in the projection device is a problem to be solved urgently.

Summary of the invention

The embodiments of the present invention provide a projection device, a projection control method, a projection control device, a projection device, and a storage medium to solve the above-mentioned problems.

In the first aspect, an embodiment of the present invention provides a projection device, including a light source device, a spatial light modulator, and a control device. The light source device is used to light up a predetermined area. The light source device includes a motion mechanism and a light source module. The motion mechanism includes a driving part and a rotating part connected to the driving part. The rotating part can be driven by the driving part to rotate around a central axis. The light source module is connected to the rotating part, and the light source module includes a plurality of light source groups. The multiple light source groups are arranged in sequence outwards along the direction away from the central axis. Each light source group includes at least one light emitting unit, and each light emitting unit can individually control light emission; the movement track of the light source module when the light source module moves under the driving of the rotating part covers the predetermined Area. The spatial light modulator is arranged on the light path of the light source light and is used to modulate the light source light to obtain a modulated image. The control device is used to: obtain the brightness distribution information of the current image frame according to the image signal to be displayed; determine the output brightness information of the light-emitting unit according to the brightness distribution information of the current image frame and the current position of each light-emitting unit; The output brightness information of each light-emitting unit respectively controls each light-emitting unit to output a desired brightness, wherein when the light-emitting unit moves outside a predetermined area, the control device controls the light-emitting unit to turn off.

In a second aspect, an embodiment of the present invention provides a projection control method, which includes: controlling the rotation of the light source module according to a preset frequency; acquiring the brightness distribution information of the current image frame according to the image signal to be displayed; and according to the brightness distribution of the current image frame Information and the current position of each light-emitting unit, determine the output brightness information of the light-emitting unit; and control each light-emitting unit to output the desired brightness according to the output brightness information of each light-emitting unit, wherein, when the light-emitting unit moves outside the predetermined area When the time, the control device controls the light-emitting unit to turn off.

In the projection equipment and projection control method provided by the embodiments of the present invention, the light source module is driven to rotate by a rotatable motion mechanism, and each light-emitting unit in the light source module can individually control light emission. The brightness distribution information of the displayed image and the real-time position information of each rotating light-emitting unit are controlled to output the desired brightness of each light-emitting unit, and high dynamic range (HDR) brightness modulation can be realized. Compared with the traditional matrix-type fixed area brightness modulation scheme, the projection equipment provided by the present invention dynamically modulates the luminous intensity of the light source device when the light source device rotates to different positions, so that fewer light-emitting units can be used to achieve multi-zone brightness modulation. Further, since each light-emitting unit can individually control light emission, a more continuous and fine illuminance modulation can be realized on the movement track of the light-emitting unit. Further, when the light-emitting unit moves outside the designated required area, the control device controls the light-emitting unit to turn off, which can further reduce the energy consumption of the projection equipment.

The projection device and projection control method of the present invention will be described in detail below with reference to the accompanying drawings.

Description of the drawings

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Fig. 1 shows a block diagram of a projection device according to an embodiment of the present invention.

FIG. 2 shows a schematic diagram of a light source device of a projection device provided by an embodiment of the present invention.

FIG. 3 shows a schematic diagram of another light source device of a projection device provided by an embodiment of the present invention.

FIG. 4 shows a schematic diagram of another light source device of the projection equipment provided by an embodiment of the present invention.

FIG. 5 shows a schematic diagram of still another light source device of the projection equipment provided by an embodiment of the present invention.

Fig. 6 shows a block diagram of a module of a control device for a projection device proposed in an embodiment of the present invention.

FIG. 7 shows a schematic diagram of illuminance modulation of the projection device proposed by the embodiment of the present invention.

FIG. 8 shows a schematic diagram of an application example of the projection device proposed by the embodiment of the present invention.

FIG. 9 shows a schematic diagram of another application example of the projection device proposed by the embodiment of the present invention.

Fig. 10 shows a flowchart of a projection control method proposed by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention. The projection control method provided by the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

With the development of display technology, the application of projection equipment is becoming more and more extensive, and people's demand for the display quality of the projection equipment is also increasing, which requires the projection equipment to have the ability of regional brightness modulation. In order to realize the brightness modulation of the designated area in the projection equipment, the inventor of the present invention has studied with great concentration and found a scheme for realizing the brightness modulation of the designated area. In this scheme, the inventor uses a matrix arrangement of light source devices to light the Required area. Specifically, the light source device includes a plurality of luminous bodies arranged in a matrix, and each luminous body can individually control light emission. By separately performing brightness modulation on the luminous bodies at different positions, the brightness modulation of a designated area can be conveniently realized. However, the inventor further discovered that when using such a light source device to achieve high dynamic range (HDR) brightness modulation, both the density and control accuracy of the luminous body must meet very high requirements, and the cost is also very high.

Therefore, the inventor further researched a scheme that can achieve high dynamic range (HDR) brightness modulation at a lower cost. His research includes at least: the arrangement and density of the luminous bodies of the light source device affect the regional brightness modulation, and the light emission of the light source device. The influence of the brightness control algorithm of the volume on the modulation of the regional brightness, the influence of the type of the luminous body of the light source device on the modulation of the regional brightness, and so on. After a lot of repeated research, the inventor proposed the light source device and the projection device of the present invention.

In the present invention, the projection equipment includes a light source device, a spatial light modulator and a control device. The light source device is used to light up a predetermined area. The light source device includes a motion mechanism and a light source module. The motion mechanism includes a driving part and a rotating part connected to the driving part. The rotating part can be driven by the driving part to rotate around a central axis. The light source module is connected to the rotating part, and the light source module includes a plurality of light source groups. A plurality of light source groups are arranged in sequence outwards along the direction away from the central axis, each light source group includes at least one light emitting unit, and each light emitting unit can individually control light emission; the movement track of the light source module when the light source module moves under the driving of the rotating part covers the predetermined Area. The spatial light modulator is arranged on the light path of the light source light and is used to modulate the light source light to obtain a modulated image. The control device is used to: obtain the brightness distribution information of the current image frame according to the image signal to be displayed; determine the output brightness information of the light-emitting unit according to the brightness distribution information of the current image frame and the current position of each light-emitting unit; The output brightness information of each light-emitting unit respectively controls each light-emitting unit to output a desired brightness, wherein when the light-emitting unit moves outside a predetermined area, the control device controls the light-emitting unit to turn off.

In the above-mentioned projection device, the light source module is driven to rotate by a rotatable motion mechanism, and each light-emitting unit in the light source module can individually control light emission. When the brightness is modulated, it is based on the brightness distribution information of the image to be displayed and The real-time position information of each light-emitting unit that rotates, and each light-emitting unit is controlled to output the desired brightness, which can realize high dynamic range (HDR) brightness modulation. When the light source device rotates to different positions, by dynamically modulating the luminous intensity of the light source device, fewer light-emitting units can be used to achieve multi-zone brightness modulation. Further, since each light-emitting unit can individually control light emission, a more continuous and fine illuminance modulation can be realized on the movement track of the light-emitting unit. Further, when the light-emitting unit moves outside the designated required area, the control device controls the light-emitting unit to turn off, which can further reduce the energy consumption of the projection equipment.

The present invention will be described in detail below with reference to the drawings and specific embodiments.

Please refer to FIG. 1. FIG. 1 shows a block diagram of a projection device 100 provided by an embodiment of the present invention. The projection device 100 may be, but is not limited to, a laser TV, an education projector, a micro-projector, a cinema projector, etc. with projection equipment, It may also be other devices with projection functions, such as personal computers, notebook computers, tablets, smart phones, smart glasses, VR glasses, etc., with projection functions. It should be noted that the projection direction of the projection device 100 in the embodiment of the present invention is not limited, and it may be rear projection or front projection.

In the embodiment of the present invention, the projection equipment 100 includes a light source device 10, a relay system 20, a spatial light modulator 30, a projection lens 40, and a control device 60. The relay system 20, the spatial light modulator 30, and the projection lens 40 are sequentially arranged on the light path of the light source light emitted by the light source device 10. The spatial light modulator 30 is used to modulate the light source light to obtain a modulated image for the projection lens 40 to perform projection.

Specifically, the light source device 10 emits a light beam (hereinafter referred to as light source light). The light source device 10 is turned on and off under the driving of the control device 60. The relay system 20 condenses the light source light to the spatial light modulator 30; the spatial light modulator operates under the drive of the control device 60, and the light source light condensed to the spatial light modulator 30 is operated under the operation of the spatial light modulator 30 Form image light. For example, the spatial light modulator 30 is a DMD (digital micro-mirror device). The DMD is composed of a digital micro-mirror array. Each micro-mirror constitutes a modulation unit, and a modulation unit is used to modulate an image corresponding to a pixel. Each micromirror is inverted under the drive of a driving signal, and the number of times of inversion of each micromirror is determined by the driving signal. The inverted micromirror reflects the light from the light source to form image light. The image light is output to the projection lens 40, and the projection lens 40 projects the image light to form an image.

Referring to FIG. 2, in the embodiment of the present invention, the light source device 10 includes a movement mechanism 12 and a light source module 14 connected to the movement mechanism 12. The movement mechanism 12 is used to drive the light source module 12 to rotate around a central axis O, and the light source module The trajectory of the group 12 when it moves under the driving of the movement mechanism 12 covers the predetermined area A, so that the light source module 14 can light up the predetermined area A. It should be understood that the shape of the predetermined area A should not be limited to the rectangular area shown in the figure, and it may have any predetermined shape, such as a triangle, a square, a rectangle, a circle, or other geometric figures.

Further, the movement mechanism 12 includes a driving part 121 and a rotating part 123 connected to the driving part 121, and the rotating part 123 can rotate around the central axis O under the driving of the driving part 121. In the embodiment of the present invention, the structure of the driving member 121 and the rotating member 123 is not limited. For example, the driving member 121 may be a micro rotating motor or a rotation driving member of a micro-electromechanical system. The rotating member 123 may be any possible structure for carrying the light source module 14, such as a rod-shaped structure or a disk-shaped structure.

The light source module 14 is connected to the rotating member 123. The light source module 14 includes a plurality of light source groups 141, and the plurality of light source groups 14 are sequentially arranged outward in a direction away from the central axis O. When the light source module 14 moves under the driving of the rotating member 123, each light source group 141 forms a movement trajectory 140 around the central axis O, and the movement trajectories of the multiple light source groups 141 are roughly parallel to each other (eg, in a parallel relationship). The combination of the motion trajectories formed by all the light source groups 141 covers the predetermined area A.

In some embodiments, as specifically shown in FIG. 2, the motion mechanism 12 is a circular motion mechanism, such as a rotating electric machine. The movement trajectory of the light source module 14 is approximately circular, and the multiple light source groups 141 are sequentially arranged outwards along the radial direction of the movement trajectory starting from the central axis O. The distance between each adjacent two light source groups 141 is approximately the same to provide approximately uniform brightness, and the motion track formed by the multiple light source groups 141 is multiple concentric circles centered on the central axis O. In order to balance uniform brightness and energy saving, the ratio of the area covered by the movement track of the light source module 14 to the area of the predetermined area A is greater than or equal to 1 and less than or equal to the first ratio, which can be 2, 3, 4, etc.

In other embodiments, as specifically shown in FIG. 3, the motion mechanism 12 is an elliptical motion mechanism, such as an elliptical machine driving part. The movement trajectory of the light source module 14 is roughly elliptical, and the multiple light source groups 141 are arranged from the central axis O along the radial direction of the movement trajectory in order to increase the utilization rate of light. The distance between each adjacent two light source groups 141 is approximately the same to make the brightness uniform, and the movement track formed by the multiple light source groups 141 is a plurality of concentric ellipses centered on the central axis O. In order to take into account energy saving, the ratio of the area covered by the movement track of the light source module 14 to the area of the predetermined area A is greater than or equal to 1 and less than or equal to the second ratio. The second ratio can be 1.5, 1.8, 2, 2.5, etc., and the second ratio can be 1.5, 1.8, 2, 2.5, etc. The second ratio may be smaller than the first ratio.

2 again, in the embodiment of the present invention, each light source group 141 includes at least one light emitting unit 1411, each light emitting unit 1411 can individually control light emission, for example, the control device 60 can individually control each light emitting unit 1411 The parameters such as opening, closing and light intensity. The light-emitting unit 1411 may be a mixed-color LED light source (such as an RGB light source), or may be a monochromatic LED light source or a laser light source, etc., and is not limited by the specification of the present invention. In the description of this specification, the term "light source group" is named only for ease of description, and does not represent the specific structure of the light source module 14, nor does it mean that the light-emitting units 1411 in the light source group 141 must be connected or assembled together. In this specification, "light source group" refers to a collection of light-emitting units 1411 having the same motion track 140, unless otherwise stated.

Further, in some embodiments, as shown in FIG. 4, in two adjacent light source groups 141, the number of light emitting units 1411 included in the light source group 141 farther from the central axis O is greater than or equal to the number of light emitting units 1411 from the central axis O. The number of light-emitting units 1411 included in the closer light source group 141. For example, a certain light source group 141 may include one light-emitting unit 1411, and another light source group 141 located on the side of the light source group 144 away from the central axis O may include two or more light-emitting units, that is, located on the outer ring movement track The upper light source group 141 can include more light-emitting units 1411. In this way, the light source group 141 at different positions has different linear speeds when the light source module 14 rotates, which may cause uneven brightness (such as the outer ring). The linear velocity of the light source group 141 is greater and therefore the light provided is darker), which is beneficial for the light source device 10 to provide more uniform and controllable light.

In the embodiment of the present invention, when the light source module 14 is driven by the movement mechanism 12, the frequency of its rotation is an integer multiple of the frame rate of the image to be displayed by the projection device 100, for example, 1 time, 2, 3 times. The rotation frequency of the driving member 121 of the motion mechanism 12 represents the refresh frame rate of the light source at each position. Therefore, ensuring that the rotation frequency of the driving member 121 is an integer multiple of the frame rate of the image to be displayed is beneficial to improve the light utilization rate. For example, when each light source group 141 includes 1 light emitting unit, and the rotation frequency of the light source module 14 is 1 times the frame rate of the image to be displayed, the refresh frame rate of the light source at each position is equal to the frame rate of the image to be displayed. Rate.

Further, in some embodiments, in order to increase the refresh frame rate of the light source at each position to improve the display effect, this can be achieved by increasing the frequency of rotation of the driving member 121, or by setting more light sources in each light source group 141. The light-emitting unit 1411 is implemented. As shown in FIG. 5, each light source group 141 may include a plurality of light emitting units 1411, and the multiple light emitting units 1411 of each light source group 141 are arranged at intervals on the movement track 140 of the light source group 141, and every two light emitting units 1411 The distance between them is equal, that is, a plurality of light-emitting units 1411 are evenly arranged on the movement track 140 of the light source group 141, which enables the light source group 141 to provide a higher light source refresh frame rate when it rotates one circle, which is beneficial to Improve the image display quality and improve the user's visual experience. For example, each light source group 141 may include three light emitting units 1411. When the rotation frequency of the driving member 121 is 1 times the frame rate of the image to be displayed, the refresh frame rate of the light source provided by the light source module 141 is that of the image to be displayed. 3 times the frame rate.

In the embodiment of the present invention, the control device 60 is used to control the movement mechanism 12 to drive the light source module 12 to rotate, and is used to control the on and off and the light intensity of each light-emitting unit 1411 according to the image signal to be displayed. When the light emitting unit 1411 moves outside the predetermined area A, the control device 60 controls the light emitting unit 1411 to be turned off to reduce the energy consumption of the projection apparatus 100.

Further, referring to FIG. 6, the control device 60 includes a brightness distribution calculation unit 62, a position calculation unit 64, an output brightness calculation unit 66 and a driving unit 68.

The brightness distribution calculation unit 62 is configured to obtain the brightness distribution information of the current image frame according to the image signal to be displayed, and calculate the required light source brightness in each unit position in the predetermined area A when the current image frame is displayed according to the brightness distribution information. Among them, each unit position can be understood as the pixel position of the current image frame, which can be represented by the rectangular coordinates (x, y) in the current image frame. The brightness distribution calculation unit 62 can obtain the brightness distribution of the current image frame by counting the image data to be displayed.

The position calculation unit 64 is configured to calculate the current position information of each light-emitting unit 1411 according to the motion parameters of the motion mechanism 12. In the embodiment of the present invention, since the light-emitting unit 1411 rotates around the central axis O, according to the real-time motion parameters of the motion mechanism 12 and the positional relationship of the light-emitting unit 1411 relative to the central axis O, the value of each light-emitting unit 1411 can be calculated The current position, which can be represented by polar coordinates (ρ, θ), where ρ represents the distance between the light-emitting unit 1411 and the central axis O, and θ represents the current rotation angle of the light-emitting unit 1411. Further, the motion mechanism 12 may also include an angle sensor, which is used to detect the real-time rotation angle of the rotating member 123, and the position calculation unit 64 can calculate each light emission according to the driving function of the motion mechanism 12 and the detection data of the angle sensor. The location information of the unit 1411 at a predetermined time.

The output brightness calculation unit 66 is configured to calculate the output brightness information of each light-emitting unit according to the obtained light source brightness required in each unit position and the current position information of each light-emitting unit. Further, the output brightness calculation unit 66 obtains the conversion relationship between the rectangular coordinates (x, y) of the screen and the polar coordinates (ρ, θ) of the light bar through the coordinate system conversion, so as to correspond to the real-time position of each light-emitting unit 1411 To the screen position in the current image frame, the output brightness information of the light-emitting unit 1411 is determined according to the corresponding screen position. The coordinate system conversion formula is:

Obtain: x=ρ×cos(θ×(2π/360)), y=ρ×sin(θ×(2π/360)), thus, the real-time position of each light-emitting unit 1411 can be corresponded to the current image The position of the picture in the frame.

The driving unit 68 is used to control the current input to each light-emitting unit 1411 to output a desired brightness according to the output brightness information. In terms of the body, the driving unit 68 is used to calculate the driving signal required by each light-emitting unit 1411 when the current image frame is displayed, and to control the driving current according to the driving signal, so as to control each light-emitting unit 1411 to output the desired brightness. Further, the driving unit 68 may determine the driving signal of the light-emitting unit 1411 according to the positional relationship between the unit position of the current image frame and the light-emitting unit 1411, and the output brightness information of the light-emitting unit 1411. It should be understood that when the light-emitting unit 1411 is driven to light up, the driving unit 68 is implemented by controlling the driving current input to the light-emitting unit 1411, and the driving unit 68 generates the driving current curve of the light-emitting unit 1411, which is used to modulate the input to the light-emitting unit. The driving current of the unit 1411 is such that the brightness parameter of the light-emitting unit 1411 meets the brightness distribution of the current image frame. The driving unit 68 can control the luminous flux and the peak light power density of the light-emitting unit 1411 based on the driving current curve.

Therefore, the above-mentioned projection device 100 can control the brightness of the corresponding light-emitting unit 1411 at each screen position according to the actual needs of each frame of the screen, and can conveniently realize the regional illuminance control, as shown in FIG. 7. In the example of illuminance modulation shown in Fig. 7, the rectangular area in area A is a predetermined area, which can also be understood as the area actually required for the image to be displayed; area B is a full circular area in the figure, which Is the complete area formed by the light-emitting unit 1411 during the movement and lighting process; area C is the area in the black part of the figure, which corresponds to the darker part of the image to be displayed; area D is the area in the gray part of the figure, which corresponds to In the area of the brighter part of the image to be displayed, by controlling the real-time brightness of the rotating light-emitting unit 1411, the area illuminance control can be conveniently realized. Moreover, in the projection device 100 provided by the present invention, the brightness of the light-emitting unit 1411 can be freely controlled when it is rotated to different positions during the rotation process, and it can be realized in the direction of the rotation track (such as the arc direction). The gradual rather than stepped illuminance modulation (as shown in area E in the figure) helps to improve the image display quality.

Further, the control device 60 further includes a motion control unit 69, which is used for controlling the driving member 121 to drive the rotating member 123 to rotate according to the frame rate of the image to be displayed, wherein the frequency of the driving member 121 rotating is the frequency of the rotation of the driving member 121 to be displayed. An integer multiple of the frame rate of the image.

In the projection device provided by the above-mentioned embodiment of the present invention, the light source module is driven to rotate by a rotatable motion mechanism, and each light-emitting unit in the light source module can individually control light emission. When the brightness is modulated, it is based on the image to be displayed. The brightness distribution information and the real-time position information of each rotating light-emitting unit are controlled to control each light-emitting unit to output the desired brightness, which can realize high dynamic range (HDR) brightness modulation. Compared with the traditional matrix-type fixed area brightness modulation scheme, the projection equipment provided by the present invention dynamically modulates the luminous intensity of the light source device when the light source device rotates to different positions, so that fewer light-emitting units can be used to achieve multi-zone brightness modulation. Further, since each light-emitting unit can individually control light emission, a more continuous and fine illuminance modulation can be realized on the movement track of the light-emitting unit. Further, when the light-emitting unit moves outside the designated required area, the control device controls the light-emitting unit to turn off, which can further reduce the energy consumption of the projection equipment.

The embodiment of the present invention also provides a specific application example based on the above-mentioned projection device 100. The projection device shown in FIG. 8 is an example of the projection device 100 in an actual application scenario, which includes substantially the same functions as the above-mentioned projection device 100. And components, this specification will not repeat them one by one, and the specific form of the projection device 100 in this embodiment will be introduced below.

In this embodiment, the light emitting unit 1411 is a color mixing LED light source (such as an RBG light source), and the relay system 20 includes a homogenizing device 22, an imaging lens 24, a dichroic mirror 26, and a light combining prism 28. The imaging lens 24 and the dichroic mirror 26 are sequentially arranged between the light source device 10 and the spatial light modulator 30 along the optical path of the light source light, and the light combining prism 28 is arranged between the spatial light modulator 30 and the projection lens 40.

Furthermore, each light-emitting unit 1411 is provided with a collimating lens, and the collimating lens converts the light emitted by the light-emitting unit 1411 into parallel light and guides it into the light homogenizing device 22. In this embodiment, the homogenizing device 22 is a compound eye module, which includes an incident fly-eye lens and an outgoing fly-eye lens arranged along the optical path. Both the incident fly-eye lens and the outgoing fly-eye lens include a plurality of microlens units arranged in an array. The shape of the micro lens unit can be adapted to the shape of the illumination light required by the projection device. The micro lens unit of the incident fly-eye lens and the micro lens unit of the outgoing fly-eye lens correspond one-to-one, and the distance between the two fly-eye lenses is reasonable according to actual needs. design. The light output from each microlens unit of the incident fly-eye lens and the outgoing fly-eye lens is more uniform. Further, the incident fly-eye lens 531 and the outgoing fly-eye lens 532 of the homogenizing device 22 may be arranged on two opposite surfaces of a flat lens to form a whole body for easy installation.

Further, in this embodiment, the relay system 20 further includes a rotating mechanism (not shown in the figure) for driving the imaging lens 24. The imaging lens 24 is connected to the rotating mechanism and can be driven by the rotating mechanism. It rotates synchronously with the light source module 14. The imaging lens 24 includes a plurality of lenses corresponding to the plurality of light-emitting units 1411, and the plurality of lenses rotate in synchronization with the corresponding light-emitting units 1411, so that the illuminance of the light-emitting units 1411 is uniformly distributed and spliced.

In this embodiment, the RBG three-color light source light emitted from the light source device 10 is homogenized through the light homogenization device 22 and the imaging lens 24, passes through the dichroic mirror, enters the separate spatial light modulator 30, and then passes through the light combining prism 28 After the light is combined, it is emitted from the projection lens 40.

The embodiment of the present invention also provides another specific application example based on the above-mentioned projection device 100. The projection device shown in FIG. 9 is an example of the projection device 100 in an actual application scenario, which includes substantially the same The functions and components will not be repeated in this specification one by one, and the specific form of the projection device 100 in this embodiment will be introduced below.

In this embodiment, there are three light source devices 10, and the light-emitting unit 1411 of each light source device 10 is a monochromatic LED light source or a laser light source. The relay system 20 includes a light combining prism 211, a diffusion film 212, and a microlens array 213. The light combining prism 211, the diffusion film 212, and the microlens array 213 are sequentially arranged in the light source device 10 and the spatial light modulator 30 along the optical path of the light source light. Meanwhile, the spatial light modulator 30 is a spatial light modulator based on a DMD chip.

In this embodiment, the structural surface of the diffusion film 212 faces the light combining prism 211, and the light source lights emitted by the three light source devices 10 are combined by the light combining prism 211 and then pass through the diffusion film 212 to obtain light with uniform illuminance. Further, the diffusion film 212 may be a polymer film doped with inorganic particles. When light enters the diffusion film 212, it will constantly shuttle through materials with different refractive indexes, and then undergo refraction, scattering and reflection, and finally achieve light diffusion. Effect.

Further, in this embodiment, the microlens array 213 includes a plurality of microlenses, and the arrangement trajectory of the microlenses is roughly the same as the movement trajectory of the light-emitting unit 1411, so that the microlens array is arranged roughly in rotational symmetry, and the arrangement density is greater than that of each lens. The arrangement density of the light-emitting units 1411 in the light source group 141. The light is shaped by a rotationally symmetrical microlens array, so that the light patterns of the regional illumination spots can be seamlessly spliced, with less overlapped areas, and uniform illuminance. Further, the arrangement density of the radial microlens array along the movement track is much greater than the radial arrangement density of the light-emitting units 1411 along the movement track. For example, there are more than 10 microlenses in the illumination range of each light-emitting unit 1411. , Thereby significantly improving the effect of spot shaping.

Based on the above-mentioned projection equipment, embodiments of the present invention also provide a projection control method. The projection control method provided in the embodiments of the present invention can be executed by a projection control device, which can be implemented by hardware and/or software, and generally It can be integrated in the projection device, and the execution of the method depends on a computer program. The computer program can run on a computer system, and the computer system can be an operating system of the projection device. The specific projection control method is introduced below.

Please refer to FIG. 10, a projection control method provided by an embodiment of the present invention. Once it is triggered, the process of the method in the embodiment can be automatically run by the projection device, wherein each step can be run as shown in the flowchart. The sequence is carried out one after the other, or multiple steps can be carried out at the same time according to the actual situation, which is not limited here. The projection control method may include step S110 to step S170.

Step S110: Control the rotation of the light source module according to the preset frequency.

Step S130: Obtain the brightness distribution information of the current image frame according to the image signal to be displayed.

Step S150: Determine the output brightness information of the light-emitting unit according to the brightness distribution information of the current image frame and the current position of each light-emitting unit.

In this embodiment, step S150 may include: according to the brightness distribution information, calculating the required light source brightness in each unit position in the predetermined area when the current image frame is displayed; Current location information; and calculating the output brightness information of each light-emitting unit according to the obtained light source brightness required in each unit location and the current location information of each light-emitting unit.

Step S170: Control each light-emitting unit to output a desired brightness according to the output brightness information of each light-emitting unit, wherein when the light-emitting unit moves out of the area, the control device controls the light-emitting unit to turn off.

In this embodiment, step S170 may include: according to the output brightness information, controlling the current input to each light-emitting unit to output a desired brightness.

It should be noted that in this article, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, It also includes other elements that are not explicitly listed, or elements inherent to the process, method, article, or device.

Through the description of the above implementation manners, those skilled in the art can clearly understand that the above-mentioned embodiment method can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is better.的实施方式。 Based on this understanding, the technical solution of the present invention essentially or the part that contributes to the existing technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, The optical disc) includes a number of instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods of the various embodiments of the present invention.

The embodiments of the present invention are described above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art are Under the enlightenment of the present invention, many forms can be made without departing from the purpose of the present invention and the scope of protection of the claims, and they all fall within the protection of the present invention.

Claims

A projection device includes a light source device, a spatial light modulator, and a control device; it is characterized in that the light source device is used to light up a predetermined area; the light source device includes:

The movement mechanism includes a driving part and a rotating part connected to the driving part, and the rotating part can rotate around a central axis under the driving of the driving part; and

The light source module is connected to the rotating member; the light source module includes a plurality of light source groups, and the plurality of light source groups are arranged in sequence outward in a direction away from the central axis, and each of the light source groups includes at least one Light-emitting units, each of the light-emitting units can be individually controlled to emit light; the movement track of the light source module when it moves under the drive of the rotating member covers the predetermined area;

The spatial light modulator is arranged on the light path of the light source light, and is used to modulate the light source light to obtain a modulated image;

The control device is used for:

Acquiring brightness distribution information of the current image frame according to the image signal to be displayed;

Determine the output brightness information of the light-emitting unit according to the brightness distribution information of the current image frame and the current position of each light-emitting unit; and

According to the output brightness information of each light-emitting unit, each light-emitting unit is respectively controlled to output a desired brightness, wherein when the light-emitting unit moves outside the predetermined area, the control device controls the light-emitting unit Extinguished.
5. The projection device according to claim 1, wherein the control device comprises:

The brightness distribution calculation unit is used to obtain the brightness distribution information of the current image frame according to the image signal to be displayed, and calculate the required amount in each unit position in the predetermined area when the current image frame is displayed according to the brightness distribution information. Light source brightness

The position calculation unit is configured to calculate the current position information of each light-emitting unit according to the motion parameters of the motion mechanism;

The output brightness calculation unit is configured to calculate the output brightness information of each light-emitting unit according to the obtained light source brightness required in each unit position and the current position information of each light-emitting unit;

The driving unit is configured to control the current input to each of the light-emitting units to output the desired brightness according to the output brightness information; and

A motion control unit, which is used to control the driving part to drive the rotating part to rotate according to the frame rate of the image to be displayed, wherein the frequency at which the driving part rotates is an integer of the frame rate Times.
The projection device according to claim 1, wherein the motion mechanism is a circular motion mechanism, and the motion track of the plurality of light source groups is driven by the rotating member with the center axis as the center of the circle. The ratio of the area covered by the movement track of the light source module to the area of the predetermined area is less than or equal to the first ratio.
The projection device according to claim 1, wherein the motion mechanism is an elliptical motion mechanism, and the motion track of the plurality of light source groups when they are driven by the rotating member is centered on the center axis. The ratio of the area covered by the movement track of the light source module to the area of the predetermined area is less than or equal to the second ratio.
The projection device according to claim 1, wherein, among the two adjacent light source groups, the number of light emitting units included in the light source group farther from the central axis is greater than or equal to the distance from the central axis. The number of light-emitting units included in a closer light source group; each light source group includes multiple light-emitting units, the multiple light-emitting units of each light source group have the same movement track, and the multiple light-emitting units of each light source group The motion track is arranged at intervals in sequence, and the distance between every two light-emitting units is equal.
The projection device according to any one of claims 1 to 5, wherein the light emitting unit is an RGB light source, and the projection device further includes a homogenizing device, an imaging lens, a dichroic mirror, a light combining prism, and a projection device. Lens, the homogenizing device, the imaging lens, and the dichroic mirror are sequentially arranged between the light source device and the spatial light modulator along the optical path of the light source light, and the light combining prism is arranged on Between the spatial light modulator and the projection lens.
7. The projection device according to claim 6, wherein each of the light-emitting units is provided with a collimator lens, and the light homogenizing device includes an incident fly-eye lens and an outgoing fly-eye lens arranged along the optical path; The projection device also includes a rotating mechanism, the imaging lens includes a plurality of lenses corresponding to the plurality of light-emitting units one-to-one, and the plurality of lenses are connected to the rotating mechanism and capable of interacting with each other under the driving of the rotating mechanism. The corresponding light-emitting unit rotates synchronously.
The projection device according to any one of claims 1 to 5, wherein there are three light source devices, the light-emitting unit of each light source device is a monochromatic LED light source or a laser light source, and the projection device It also includes a light combining prism, a diffusion film, and a microlens array. The light combining prism, the diffusion film, and the microlens array are sequentially arranged on the light source device and the spatial light modulator along the optical path of the light source light. The spatial light modulator is based on DMD.
8. The projection device according to claim 8, wherein the arrangement trajectory of the microlenses in the microlens array is consistent with the movement trajectory of the light-emitting unit of the light source module, and the arrangement density of the plurality of microlenses is greater than that of the light-emitting unit. The arrangement density of the unit.
A projection control method, characterized in that it is applied to the projection device according to any one of claims 1-9, and the projection control method comprises:

Controlling the rotation of the light source module according to a preset frequency;

Acquiring brightness distribution information of the current image frame according to the image signal to be displayed;

Determine the output brightness information of the light-emitting unit according to the brightness distribution information of the current image frame and the current position of each light-emitting unit; and

Each light-emitting unit is controlled to output a desired brightness according to the output brightness information of each light-emitting unit, wherein when the light-emitting unit moves outside the predetermined area, the light-emitting unit is controlled to be turned off.